Installing an edlebrock intake....what do I need?

[D.Hearne]

If you're using your original 1 inch spacer, then that's probably your problem. The bottom side is open, and doesn't get sealed with many Edelbrock "bare bones" carb flanges. You have a massive vacuum leak there if that's the case. Use a solid aftermarket carb spacer and that'll take care of the problem.

 

[mustangfb66]

The spacer I used was open on the bottom side. I almost didn't use it but I couldn't figure out what to do with the PCV connection. What should I do with the PCV connection (on pass. side valve cover)? I have a breather on the driver's side valve cover that goes to the air cleaner.

Would it be alright if I just used a skinny spacer like 3/8 or something?

I really apreciate your input. I was pretty stumped!
Thanks,
Efren

 

[D.Hearne]

If you're using a Holley or Edelbrock carb, they both have 3/8 nipples in their bases for hooking up the PCV hose. If your hose is too big then get a 3/8 nipple PCV valve from your local parts house and plumb it with 3/8 vacuum hose from the right or left valve cover, doesn't matter which side, either will be OK. The opposite valve cover can have an open breather cap to let fresh air into the crankcase, doesn't have to come from the aircleaner. If you're using a Motorcraft carb, then you can just plumb the PCV hose directly into one of the vacuum ports in the intake runners. The PCV system is simple, and revisions can be made from the many PCV valves available at any parts house to fit any application.

 

[mustangfb66]

The carb I am using doesn't have a place for the PCV hose to hook up. So you mean I can just plumb the PCV into one of the holes on the intake that I pluged up?

Also, Can I just take out the spacer and mount the carb directly to the manifold or will that create more problems?

Thanks,
Efren

 

[D.Hearne]

The carb I am using doesn't have a place for the PCV hose to hook up. So you mean I can just plumb the PCV into one of the holes on the intake that I pluged up?

Also, Can I just take out the spacer and mount the carb directly to the manifold or will that create more problems?

Thanks,
Efren

Yes, and Yes to both your questions. The PCV system just sucks the excess crankcase fumes out of the motor,to prevent their building enough pressure in there to blow the seals on the crank. It can be plumbed directly into any of the vacuum ports that are in the intake runnners, this is the same vacuum that the port in the carb or spacer sees. Some motors had the PCV routed this way, such as the GT 390 and the 428 CJ's, except the PCV was drawn from two runners instead of one. And as for the carb spacer, you can eliminate it if necessary but most motors like the extra plenum volume they provide in the higher rpm range. I like to use as high a spacer under the carb as hood clearance will allow, but the motor will run OK without them.